There is three different size pinion bearings for an 8.5 the newer Chevy trucks use a larger bearing and still has an 8.5 rear best bet is to remove the bearings and go off the part numbers they're usually in stock at most part stores
Looking for a RT side intercooler bracket for a CAS V1 stock location intercooler. Or if someone can send me some photos of what it looks like I'll make one . Thanks Shawn
The ATR stock replacement header did not look like there other Headers I am on the road it will be a few hours before I can post pics but I am pretty sure that's what you have